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The expression and prognostic potential of SMAD4 in NSCLC in the Kaplan–Meier plotter database. (A) SMAD4 expression was lower in NSCLC tissues than in normal tissues. (B) Kaplan–Meier survival curves comparing high and low SMAD4 expression. NSCLC = non-small cell lung cancer, SMAD4 = SMAD family member 4.
